Recent content by dog22

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    2018 Mercury 40 EFI – rhythmic RPM surging at WOT after 5 minutes – video

    Sounds like a fuel or air problem. It's not getting enough fuel, which can indicate a bad fuel pump or a clogged fuel filter, or it's sucking air from somewhere else rather than the intake- a bad seal or a vacuum leak somewhere in the engine block
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    Question about the 1990s era 75/80 and 90 lower unit swap to 100/115 and 125hp

    I already have the manual that covers both engines, but since the 75hp powerhead blew up, I have a 115hp powerhead sitting around that I want to mount in the 75hp lower. The power tilt and trim are the same
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    Question about the 1990s era 75/80 and 90 lower unit swap to 100/115 and 125hp

    Don't know if a 1993 Mercury 75 hp lower unit will work on a 1991 Mercury 115. According to my manual, the gear ratio for the 75 is 2.3:1, and the gear ratio for the 115 is 2.07:1. Please let me know if someone has tried this and had good results
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    Broken driveshaft inside powerhead of 2024 4hp fourstroke mercury

    remove all the bolts that are exposed under the lower cowling and that little powerhead should come of you don't even need a hoist it only weighs 10 or15 pound max
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    1989 80Hp trim switch location

    those engines did not came with a trim and tilt switch because of the butterfly cowlings I personally like those cowlings because you can take them of in a few seconds and service your engine very easy because everything is out in the open you can still ad a switch with a quick connect if you...
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    time to replace power trim relays on merc 90hp 2001 again?

    I don't know if the engine is used in salt water or fresh water ? i have never replaced 1 of those relays in all my mercs they never go bad unless you have corrosion on the tilt and trin wiring and that will increase the resistance which will blow the relay but if you do service couple of...
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    98 Mariner 75 hp gas in oil reservoir

    no problem I'm glad you found it hopefully changing that valve will solve your problem
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    98 Mariner 75 hp gas in oil reservoir

    there is a 1-way brass valve between the oil pump and the main fuel line that gets fuel to the carburetors if that valve is bad gas can get from the line into the pump and into the oil tank another way gas can get into your oil tank is when your tank builds pressure if is not vented and gas...
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    Attempting a motor rebuild

    from the video, It looks like you might have a broken top ring but you won't know for sure till you dismantle the motor if that is the case your work is easy do a slight hone replace the broken ring and put the motor together using the proper torque values from the manual if you have one
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    3.5 hp Mercury carb

    I have the same engine but in the 2.5 version the carburetor on this engine is very problematic the carburetor on my engine started to malfunction after only 8 hours of operation and was leaking fuel all over the lake and would not power up when I increased the throttle but wood die I fixed...
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    Lower unit gear oil type

    mercury quicksilver marine gear oil 1-litre bottle should be the norm and what the mercury recommends for that engine is a little pricy but you only have to change it once a year if the seals in your lower unit are in good order and not leaking
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    fuel leaking from weep hole

    mercury u mercury usually uses an electric enricher valve and when you push in the key this enricher valve squirts a small amount of fuel into the crankshaft chamber after the carburetors for the cold starting but your engine might been set up differently but the part that Is leaking is an...
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    fuel leaking from weep hole

    That is the accelerator pump that is leaking you need a new accelerator pump diagram and a new plastic button that you are pressing in the video they usually come in 1 order
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    1990 Force 120HP #2 Cyl zero compression and upon opening piston shows damage

    I think you are going to be ok with those ring gaps I did a very fast rebuild on my 2003 mercury 125 3 years ago and I only put in new piston rings on the motor and a used standard piston from ebay for cyl2 which was blown and the motor is still running strong to this day without problems my...
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    need some help on base timing on a 2003 mercury 125 2+2 outboard

    I have a 2003 mercury 125 2+2 outboard does anyone knows what the idle base timing should be on this motor
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